The egg weighs about twice as much as an egg labeled large by U.S. Department of Agriculture standards and exceeds the average 2 1/2 ounces for a jumbo egg.

“It’s big. It’s twice the size of a large egg,” said Iowa State University professor Hongwei Xin, director of the school’s egg industry center.

Batten said he is planning to contact Guinness World Records to determine whether the egg was a record-setter. On its Web site, Guinness makes no mention of largest egg laid by a chicken. It lists a more than 5-pound ostrich egg as the biggest egg laid by a bird.

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